.login{
    width:400px;
    height: 300px;
    opacity:.6;
    background: #ffffff;
    position: absolute;
    top: 50%;
    margin-top: -150px;
    left:50%;
    margin-left: -200px;
    padding:70px 50px 50px 50px;
    border:1px solid blue;
    border-radius: 10px;

}

.sub{
    width: 100px;
   position: absolute;
   left: 50%;
   margin-left: -50px;
   margin-top: 30px;
}